4-82

Thermal Information

Maximum Supply Voltages

Uncommitted Switch Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . -80V

ESD (Human Body Model). . . . . . . . . . . . . . . . . . . . . . . . . . . . 500V

Operating Conditions

Temperature Range

Uncommitted Switch (loop back or relay driver). . . . . . . +5V to -80V

Thermal Resistance (Typical, Note 1)

PLCC Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

53

(PLCC - Lead Tips Only)

Die Characteristics

Process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Bipolar-DI

CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operationofthe

device at these or any other conditions above those indicated in the operational sections of this specification is not implied.

NOTE:

1.

Electrical Specifications

current limit = 25mA. All AC Parameters are specified at 600

Ω 2-wire terminating impedance over the frequency

band of 300Hz to 3.4kHz. Protection resistors = 0

Ω.

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNITS

RINGING PARAMETERS

VRB Input Impedance

480

-

-

k

Ω

AC TRANSMISSION PARAMETERS (Forward Active and Reverse Active, BSEL = 0, unless otherwise specified.)

Receive Input Impedance

160

-

-

k

Ω

Transmit Output Impedance

--

1

Ω

4-Wire Port Overload Level

THD = 1%

3.1

3.5

-

2-Wire Port Overload Level

THD = 1%

3.1

3.5

-

2-Wire Return Loss

300Hz

≤ f < 1kHz

30

45

-

dB

1kHz

≤ f ≤ 3.4kHz

35

45

-

dB

Longitudinal Current Capability (Per Wire)

Test for False Detect

-

20

-

Test for False Detect, Low Power Standby, BSEL = 0

-

10

-

2-Wire Longitudinal Balance

Tested per IEEE455-1985, with 368

Ω per wire.

53

-

-

dB

4-Wire Longitudinal Balance

Tested per IEEE455-1985, with 368

Ω per wire.

59

-

-

dB

4-Wire to 4-Wire Insertion Loss

-6.22

-6.02

-5.82

dB

2-Wire to 4-Wire Level Linearity

4-Wire to 2-Wire Level Linearity

Referenced to -10dBm

+3 to -40dBm, 1kHz

-

0.025

-

dB

-40 to -50dBm, 1kHz

-

0.050

-

dB

-50 to -55dBm, 1kHz

-

0.100

-

dB

Idle Channel Noise 2-Wire

C-Message

-

16

19

dBrnC

Psophometric

-

-74

-71

dBmp

DC PARAMETERS

Loop Current Limit Programming Range

Max Low Battery = -52V, BSEL = 0

15

-

45

mA

Loop Current Accuracy

-

-

10

%

Loop Current During Low Power Standby

Forward polarity only.

17

-

26

mA

Open Circuit Voltage

(|Tip - Ring|)

BSEL = 0

14

15.5

17

V

BSEL = 1

37.5

40

42.5

V

Low Power Standby Open Circuit Voltage (Tip - Ring)

BSEL = 1

43

45

47

V

Ring Trip Programming Current Accuracy

-

-

10

%

HC5549